208. In computing the income of a taxpayer from the taxpayer’s business as an insurance agent or broker, there may be deducted, as a reserve in respect of unearned commissions from that business, only an amount equal to the lesser of(a) the aggregate of all amounts each of which is that proportion of an amount that has been included in computing the taxpayer’s income for the year or a previous year as a commission in respect of an insurance contract other than a life insurance contract, that the number of days in the period provided for in the insurance contract that fall after the end of the taxation year is of the total number of days in that period, and
(b) the aggregate of all amounts each of which is the amount that would, but for this section, be deductible under section 150 for the year in respect of a commission referred to in paragraph a.